Regular Expressions must start and finish with a forward slash ("/"). You can find a good library of regular expressions at http://www.regexlib.net/. These patterns will almost all work if surrounded with the forward slash.

Numbers from 1 to 999, 1.000 to 999.999 to 999.999.999

Number validation with optional decimal (for price)

Accepts numbers from 0 to 199, with 2 decimal optional:

/^([1][0-9][0-9]|[1-9][0-9]|[0-9])((\.)[0-9][0-9])?$/

Forces two decimal points and accepts numbers from 1.00 to 999,999,999.00 with an optional comma delimiting thousands/millions
including all of the following: 1.00, 1,000.00, 12,345.67, 12345,02, 123,456,468.00, 1234566.00, 123456789.00
but not 1,23.00, 12,3.4 or 1234,43.04

/^[1-9][0-9]{0,2}(?:,?[0-9]{3}){0,3}\.[0-9]{2}$/

Similar to the above: Forces two decimal points but accepts a "0" before decimal separator ",".

/[0-9]{0,2}(?:,?[0-9]{3}){0,3}\.[0-9]{2}$/

Same as above but the two decimal points are optional:

/^[1-9][0-9]{0,2}(?:,?[0-9]{3}){0,3}(?:\.[0-9]{2})?$/

Month (1-12)

If you want to ask for the month a person was born you can validate the input as follows:

/^[0]*[1-9]$|^[0]*1[0-2]$/

Minimum width (set to 3 in this example)

/^.{3,}$/

Currency

US currency (dollar sign and cents optional)

/^\$?\d+(\.(\d{2}))?$/

Check for comma usage:

/^\$?\d{1,3}(\d+(?!,))?(,\d{3})*(\.\d{2})?$/

Swiss price

A number with two decimal numbers after the decimal point of which the last one is either a 5 or a 0:

/^(\d+)(\.\d(05)?)?$/

Validate score

1-10

/^[1-9]{1}$|^10$/

1-100

/^[1-9]?[0-9]{1}$|^100$/

Text validation

currently multiple short text doesn't support minimum or maximum answers. One way around this is to use a long free text type question with a regular expression.

The following test for at least one word per line for at least 3 lines and no more than 10 lines.

Word count

The following restricts the number of words allowed to a minimum of 1 and a maximum of 200

/^[-\w]+(?:\W+[-\w]+){0,199}\W*$/

To increase the minimum change the zero part of {0,199}

To increase or decrease the maximum change the "199" part of {0,199}

Time validation

There are a number of ways of writing time formats. Some of the possible options are 12 hour or 24 hour, with seconds or without. Although it is an option to use the date question type (it can also capture time) you can use "short free text" with one of the validation regular expressions below:

The following three validation strings test for 24 hour time (in order of appearences) without seconds, with optional seconds lastly with seconds required.

/^(?:[01][0-9]|2[0-3]):[0-5][0-9]$/

/^(?:[01][0-9]|2[0-3]):[0-5][0-9](?::[0-5][0-9])?$/

/^(?:[01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]$/

The following three match 12 hour time, as above with seconds, optional seconds and with seconds required

US states

Profanity Filter

To filter profanity words from an answer:

/^(?i)((?!\bENTERPROFANITYHERE\b).)*$(?-i)/

Replace "ENTERPROFANITYHERE" with your bad word.

The \b will allow passing of words such as "assassination" & "hello" if you enter "ass" or "hell" as your profanity word. This also works if you are trying to omit other words, names etc. from answers.